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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fba5d1b21232ff4b81ecc26b1d27d264a71bbbf148418a95287f8004007a581' 
  AND token = 'DufOg7xPV293YGNj4DvAuTrWcFTcdSTN5aLpJb1H3jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}